JP4306532B2 - Recording apparatus and method, recording medium, and program - Google Patents

Description

  The present invention relates to a recording apparatus and method, a recording medium, and a program, and in particular, a recording apparatus and method for recording content data related to AV data on a data recording medium on which AV data is recorded, a recording medium, and a program About.

  So-called post recording (post scoring), in which voices such as narration and sound effects are added to the captured video later, is widely performed.

  In recent years, when data (hereinafter referred to as AV data) including video data and audio data captured by a video camera or the like is recorded on a data recording medium, the recorded AV data is overlaid on the audio data and AV data to be recorded. A recording method has been proposed in which an area (hereinafter referred to as an auxiliary area) in which image data and text data (hereinafter referred to as content data) are additionally recorded is secured in advance.

  There is an upper limit to the data amount (bit rate) of content data that can be recorded in the auxiliary area, and when recording content data in the auxiliary area, the total data amount (bit rate) of the content data is within the data amount of the auxiliary area. In addition, it is necessary to adjust the compression rate and bit rate for encoding the content data.

  However, if the content data is recorded in the auxiliary area after encoding at a low compression rate or high bit rate so that the quality is as high as possible, and another content data is recorded in the auxiliary area, the auxiliary area is not available. There was a problem that there was a case where another area data could not be added and recorded due to insufficient area.

  In addition, when content data is recorded by simply encoding at a high compression rate or low bit rate so that a large amount of content data can be recorded in the auxiliary area, the number of recorded content data is small and there is an empty area in the auxiliary area. Even when there are many, there is a problem that the quality of content recorded as content data deteriorates.

  The present invention has been made in view of such a situation, and makes it possible to record one or more pieces of content data with higher quality by more effectively using an area of a data recording medium.

The recording apparatus of the present invention records AV (Audio Visual) data in which video data and audio data are multiplexed and recorded for each predetermined reproduction time, and divides each AV data that is divided and recorded. In a recording apparatus for recording content data on a data recording medium in which a recording area of a predetermined recording capacity is secured for additionally recording content data to be reproduced in synchronization with reproduction of recorded AV data A read control means for controlling reading of the content data from the recording medium, an encoding / decoding means for encoding and decoding the content data, and a recording control means for controlling the recording of the content data on the data recording medium , when recording the first content data recording area, coding and decoding means, one recording area to the recording capacity of the recording area As the ratio of the amount of data to be recorded is below a predetermined value, and encodes the content data, the recording control means to the recording area of the data recording medium, the encoded content data by coding and decoding means recording When the second content data is added and recorded in the recording area in which the first content data as the content data is recorded, the recording capacity of the free area in the recording area is recorded in one recording area. The read control means controls reading of the first content data from the data recording medium, and the encoding / decoding means reads the first content data read from the data recording medium. The first content data and the second container recorded in one recording area are decoded. The decoded first content data and second content data are encoded so that the total data amount of the two data is less than or equal to the recording capacity of the recording area, and the recording control means The recording of the first content data and the second content data encoded by the encoding / decoding means is controlled .

  The encoding / decoding means encodes the first content data and the second content data so that a ratio between the data amount of the first content data and the data amount of the second content data becomes a predetermined value. Can be.

  The encoding / decoding means can encode the content data at a compression rate or bit rate determined from the content data input path.

According to the recording method of the present invention, AV (Audio Visual) data obtained by multiplexing video data and audio data is divided and recorded for each predetermined reproduction time, and is divided for each AV data that is divided and recorded. A recording method for recording content data on a data recording medium in which a recording area of a predetermined recording capacity for recording additional content data to be recorded in synchronization with the playback of recorded AV data is secured If the first content data is recorded in the recording area, the content data is encoded so that the ratio of the amount of data recorded in one recording area to the recording capacity of the recording area is equal to or less than a predetermined value , to the recording area of the data recording medium, and controlling recording of encoded content data, the first content data as content data serial When the second content data is additionally recorded in the recorded recording area, the data recording is performed when the recording capacity of the empty area of the recording area is smaller than the data amount of the second content data recorded in one recording area. First content data and second content data to be recorded in one recording area by controlling reading of the first content data from the medium, decoding the first content data read from the data recording medium The decoded first content data and second content data are encoded so that the total data amount is equal to or less than the recording capacity of the recording area, and the encoded first content data is recorded on the recording area of the data recording medium. The method includes a step of controlling recording of the content data and the second content data .

The program recorded on the recording medium of the present invention is AV data in which AV (Audio Visual) data obtained by multiplexing video data and audio data is divided and recorded every predetermined reproduction time. Content data on a data recording medium in which a recording area of a predetermined recording capacity for recording additional content data to be recorded in synchronization with the reproduction of AV data recorded separately is secured When the first content data is recorded in the recording area on the computer that performs the process of recording the data, the ratio of the data amount recorded in one recording area to the recording capacity of the recording area is equal to or less than a predetermined value. encodes the content data, and controls to the recording area of the data recording medium, the recording of the encoded content data, content data When the second content data is added and recorded in the recording area in which the first content data is recorded, the second content recorded in the recording area of the recording area in the free area is recorded. When the data amount is smaller than the data amount, the reading of the first content data from the data recording medium is controlled, and the first content data read from the data recording medium is decoded and recorded in one recording area. The decoded first content data and second content data are encoded so that the total data amount of the one content data and the second content data is less than or equal to the recording capacity of the recording area, and the data recording medium is recorded. Controlling the recording of the encoded first content data and second content data in the area; To execute the non-treated.

In the program of the present invention, AV (Audio Visual) data obtained by multiplexing video data and audio data is divided and recorded for each predetermined reproduction time, and divided and recorded for each AV data that is divided and recorded. the data recording medium in which recording areas of a predetermined recording capacity is ensured for recording by adding the content data reproduced in synchronization with reproduction of AV data that is, a computer to perform processing for recording content data in the case of recording the first content data in the recording area, so that the ratio of the amount of data to be recorded in one recording region for recording capacity of the recording area is less than a predetermined value, and encodes the content data, the data to the recording area of the recording medium, the recording of the encoded content data is controlled, the first content as a content data When the second content data is additionally recorded in the recording area where the data is recorded, the recording capacity of the free area of the recording area is smaller than the data amount of the second content data recorded in one recording area. When the first content data read from the data recording medium is controlled and the first content data read from the data recording medium is decoded and recorded in one recording area, The decoded first content data and second content data are encoded so that the total data amount of the two content data is less than or equal to the recording capacity of the recording area, and is encoded into the recording area of the data recording medium. In addition, a process including a step of controlling recording of the first content data and the second content data is executed.

In the recording apparatus, recording method, recording medium, and program of the present invention, when the first content data is recorded in the recording area of the recording medium, the ratio of the amount of data recorded in one recording area to the recording capacity of the recording area is The content data is encoded so as to be equal to or less than a predetermined value, the recording of the encoded content data in the recording area of the data recording medium is controlled, and the first content data as the content data is recorded. When the second content data is additionally recorded in the recording area, the recording capacity of the free area in the recording area is smaller than the data amount of the second content data recorded in one recording area. Reading of the first content data is controlled, and the first content data read from the data recording medium is controlled. The first content data decoded so that the total data amount of the first content data and the second content data recorded in one recording area is equal to or less than the recording capacity of the recording area after the content data is decoded. The second content data is encoded, and the recording of the encoded first content data and second content data in the recording area of the data recording medium is controlled.

  As described above, according to the recording apparatus and method, the recording medium, and the program, content data related to AV data can be recorded on the data recording medium. In addition, according to the recording apparatus and method, the recording medium, and the program of the present invention, it is possible to record one or more pieces of content data with higher quality by using the area of the data recording medium more effectively.

  Embodiments of the present invention will be described below. The correspondence between the invention described in this specification and the embodiments is illustrated as follows. Although this description is described in this specification, there is an embodiment which is not described here as corresponding to the invention. It does not mean that it does not correspond to. Conversely, even if an embodiment is described herein as corresponding to an invention, that means that the embodiment does not correspond to an invention other than the invention. Absent.

  Further, this description does not mean that all the inventions described in this specification are claimed. In other words, this description is an invention described in the present specification and is not claimed in this application, that is, a future divisional application, appearing by amendment, or added. It does not deny the existence of the invention.

According to the present invention, a recording apparatus is provided. In this recording apparatus (for example, the video camera 1 in FIG. 1), AV (Audio Visual) data obtained by multiplexing video data and audio data is divided and recorded every predetermined reproduction time, and is divided and recorded. A recording area of a predetermined recording capacity (for example, an auxiliary area in FIG. 6) for additionally recording content data to be reproduced in synchronization with the reproduction of the AV data recorded separately. 221) is a recording device that records the content data on a data recording medium (for example, the recording medium 41 in FIG. 1), and a read control unit that controls reading of the content data from the recording medium (For example, the read control unit 124 in FIG. 5) and encoding / decoding means (for example, the audio processing unit 10 in FIG. 3) for encoding and decoding the content data. Includes the image processing unit 103, a and a data processing control unit 122 of FIG. 5), the recording control means for controlling recording of said content data to said data recording medium (e.g., a recording control section 123) of FIG. 5, When recording the first content data in the recording area, the encoding / decoding means makes the ratio of the amount of data recorded in one recording area to the recording capacity of the recording area equal to or less than a predetermined value. The content data is encoded, and the recording control means controls the recording of the content data encoded by the encoding / decoding means in the recording area of the data recording medium, and the first as the content data When the second content data is additionally recorded in the recording area where the content data is recorded, When the recording capacity of the free area is smaller than the data amount of the second content data recorded in one recording area, the read control means reads out the first content data from the data recording medium And the encoding / decoding means decodes the first content data read from the data recording medium and records the first content data recorded in one recording area and the second content data. The decoded first content data and the second content data are encoded so that the total data amount of the content data is equal to or less than the recording capacity of the recording area, and the recording control unit is configured to record the data recording medium. The first content data encoded by the encoding / decoding means and the recording area Control recording of the second content data .

According to the present invention, a recording method is provided. In this recording method, AV (Audio Visual) data obtained by multiplexing video data and audio data is divided and recorded for each predetermined reproduction time, and the divided AV data is divided and recorded. Data recording medium having a recording area (for example, auxiliary area 221 in FIG. 6) having a predetermined recording capacity for additionally recording content data to be reproduced in synchronization with reproduction of recorded AV data A recording method for recording the content data on the recording medium 41 (for example, the recording medium 41 in FIG. 1), wherein the ratio of the amount of data recorded in one recording area to the recording capacity of the recording area is equal to or less than a predetermined value. so that encodes the content data (e.g., step S45 in step S28 or 13 in FIG. 11), the recording area of the data recording medium The recording of the encoded content data is controlled (for example, step S30 in FIG. 11), and the second content data is added to the recording area where the first content data as the content data is recorded In the case of recording, the first content data from the data recording medium when the recording capacity of the empty area of the recording area is smaller than the data amount of the second content data recorded in one recording area The first content data read from the data recording medium is decoded and the total of the first content data and the second content data recorded in one recording area is calculated. The decoded first content data, and so that the data amount is less than or equal to the recording capacity of the recording area. And the second content data is encoded (for example, steps S31 to S35 in FIG. 12 or steps S42 to S46 in FIG. 13), and the encoded first content data to the recording area of the data recording medium is encoded. And a step of controlling recording of the second content data (for example, step S36 in FIG. 12 or step S47 in FIG. 13).

According to the present invention, a program is provided. The recording device (for example, the video camera 1 in FIG. 1) stores the program in which AV (Audio Visual) data obtained by multiplexing video data and audio data is divided and recorded every predetermined reproduction time. For each recorded AV data, a recording area of a predetermined recording capacity (for example, shown in the figure) for additionally recording content data to be reproduced in synchronization with the reproduction of the AV data recorded separately. One auxiliary recording area corresponding to the recording capacity of the recording area in a computer that performs processing for recording the content data on a data recording medium (for example, the recording medium 41 in FIG. 1) in which six auxiliary areas 221) are secured. as the ratio of the amount of data to be recorded is below a predetermined value, the encoding the content data (e.g., step S28 of FIG. 11 or 13 step S45), to the recording area of the data recording medium, controls the recording of the encoded the contents data (e.g., step S30 in FIG. 11), the first content data as the content data is recorded When the second content data is additionally recorded in the recording area, the recording capacity of the free area in the recording area is smaller than the data amount of the second content data recorded in one recording area And controlling the reading of the first content data from the data recording medium, decoding the first content data read from the data recording medium, and recording the first content data in one recording area. The total data amount of one content data and the second content data is equal to or larger than the recording capacity of the recording area. The decoded first content data and second content data are encoded so as to become (for example, steps S31 to S35 in FIG. 12 or steps S42 to S46 in FIG. 13), and the data recording medium A process including a step of controlling recording of the encoded first content data and second content data in the recording area (for example, step S36 in FIG. 12 or step S47 in FIG. 13) is executed.

  This program can be recorded on a recording medium (for example, the removable medium 521 in FIG. 14).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an embodiment of a video camera 1.

  The video camera 1 includes a control unit 11, a camera 12, a microphone 13, an A / D (Analog / Digital) conversion unit 14, a line video input unit 15, a line audio input unit 16, an input detection unit 17, an input switching unit 18, and an input. Buffer 19, data processing unit 20, memory 21, drive 22, output buffer 23, line video output unit 24, line audio output unit 25, LCD (Liquid Crystal Display) controller 26, LCD 27, operation unit 28, and communication unit 29 Composed.

  The control unit 11 includes a general-purpose embedded microcomputer or a dedicated IC (Integrated Circuit), and controls the entire video camera 1. The control unit 11 executes a predetermined program. The control unit 11 acquires a command input by the user operating the operation unit 28 based on the program being executed, and controls each unit of the video camera 1 according to the command. The control unit 11 causes each unit of the video camera 1 to execute various processes.

  In addition, the control unit 11 supplies AV data input from an external information processing apparatus or content data such as image data, audio data, text data, etc. to the data processing unit 20 via the communication unit 29, Or stored in the memory 21. The AV data includes video data for reproducing a moving image and audio data for reproducing sound synchronized with the moving image. For example, video data and audio data are multiplexed with AV data. The content data is data for reproducing a moving image, a still image, sound, text, or the like that is synchronized with an image and sound reproduced by AV data.

  Further, the control unit 11 stores content data (for example, characters or characters to be displayed in accordance with the video) stored in a ROM (Read Only Memory) 62 (FIG. 2) in the control unit 11 and recorded in addition to the AV data. Image data such as frames and sound data such as sound effects) is supplied to the data processing unit 20.

  Further, as will be described later with reference to FIGS. 10 to 13, the control unit 11 sets a recording mode for recording data on the recording medium 41. The control unit 11 supplies information indicating the set recording mode to the data processing unit 20. Depending on the recording mode, when the video camera 1 records AV data on the recording medium 41 or when the video camera 1 records audio data synchronized with the AV data recorded on the recording medium 41 (after-recording), The bit rate of AV data or audio data to be recorded is determined. Details of the recording mode will be described later.

  Further, the control unit 11 controls the drive 22 to store file management information and a movie information file 234 (FIG. 9) for managing data and files recorded on the recording medium 41 in the recording medium 41. Or read from the recording medium 41. The file management information includes information indicating the amount of data recorded in the recording area of each recording area as a unit of data recording in the recording medium 41. Details of the movie information file 234 will be described later with reference to FIG. 9. The movie information file 234 includes information indicating the recording position and data amount of AV data and content data recorded on the recording medium 41. It is. In addition, the control unit 11 updates the file management information, generates or updates the movie information file 234 (FIG. 9). An example of the functional configuration of the control unit 11 will be described later with reference to FIG.

  The camera 12 images a subject as a moving image and supplies video data obtained by the imaging to the input detection unit 17. An example of the functional configuration of the camera 12 will be described later with reference to FIG.

  The microphone 13 converts the sound into an analog electric signal, and supplies the audio signal, which is the converted electric signal, to the A / D conversion unit 14. The A / D conversion unit 14 A / D converts the audio signal supplied from the microphone 13 into digital audio data, and supplies the audio data to the input detection unit 17.

  The line video input unit 15 is a so-called input interface, is connected to an external video device, acquires video data input from the connected video device, and supplies the acquired video data to the input detection unit 17. To do. The line audio input unit 16 is a so-called input interface, is connected to an external audio device, acquires audio data input from the connected audio device, and supplies the acquired audio data to the input detection unit 17. .

  The input detection unit 17 detects that video data or audio data has been supplied from the camera 12, the A / D conversion unit 14, the line video input unit 15, or the line audio input unit 16, and sends the video to the control unit 11. A detection signal indicating that data or audio data has been supplied is supplied. Further, the input detection unit 17 supplies video data or audio data supplied from the camera 12, A / D conversion unit 14, line video input unit 15, or line audio input unit 16 to the input switching unit 18.

  The input switching unit 18 converts the image data or audio data supplied from the camera 12, the A / D conversion unit 14, the line video input unit 15, and the line audio input unit 16 via the input detection unit 17 to the control unit 11. The selected image data or audio data is supplied to the input buffer 19.

  The input buffer 19 temporarily stores the image data or audio data supplied from the input switching unit 18 and supplies the stored image data or audio data to the data processing unit 20.

  The data processing unit 20 reads the video data or audio data stored in the input buffer 19 and adjusts the compression rate or the bit rate according to the recording mode based on the information indicating the recording mode supplied from the control unit 11. Then, the video data or audio data is encoded (encoded) at the adjusted compression rate or bit rate. The data processing unit 20 further multiplexes video data and audio data to generate AV data, and supplies the generated AV data to the memory 21. For example, the data processing unit 20 multiplexes the video data and the audio data by alternately arranging the video data and the audio data based on the reproduction time.

  Further, when recording the audio data in the auxiliary area 221 (FIG. 6) of the recording medium 41, the data processing unit 20 reads the audio data stored in the input buffer 19 and changes the recording mode supplied from the control unit 11. Based on the information shown, the compression rate or bit rate is adjusted according to the recording mode, and the audio data is encoded at the adjusted compression rate or bit rate. The data processing unit 20 supplies the encoded audio data to the memory 21.

  Further, the data processing unit 20 acquires AV data or content data read from the recording medium 41 by the drive 22 and stored in the memory 21. In addition, the data processing unit 20 acquires content data stored in the ROM 62 of the control unit 11. Further, the data processing unit 20 acquires AV data or content data acquired from the external information processing apparatus by the control unit 11 via the communication unit 29 from the control unit 11.

  Further, the data processing unit 20 separates the acquired AV data into video data and audio data as necessary, and supplies the separated video data and audio data to the control unit 11 or the output buffer 23. In addition, the data processing unit 20 performs data processing such as decoding and encoding on the acquired content data as necessary, and supplies the processed content data to the control unit 11 or the memory 21.

  The memory 21 temporarily stores AV data or content data supplied from the control unit 11 or the data processing unit 20. The memory 21 temporarily stores AV data or content data read from the recording medium 41 by the drive 22 and supplied. The memory 21 supplies the stored AV data or content data to the control unit 11, the data processing unit 20, or the drive 22 as necessary.

  The drive 22 is appropriately loaded with a recording medium 41 made of a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory. The drive 22 records the AV data or content data stored in the memory 21 on the recording medium 41 according to a format described later with reference to FIGS. 6 and 7 under the control of the control unit 11. Further, the drive 22 reads AV data or content data data recorded on the recording medium 41 under the control of the control unit 11, and supplies it to the control unit 11 or the memory 21 as necessary.

  Further, the drive 22 reads the file management information and movie information file 234 (FIG. 9) recorded on the recording medium 41 from the recording medium 41 under the control of the control unit 11, and reads the read file management information and movie. The information file 234 (FIG. 9) is supplied to the control unit 11. In addition, the drive 22 acquires the file management information and the movie information file 234 (FIG. 9) generated or updated by the control unit 11, and the acquired file management information and the movie are controlled under the control of the control unit 11. The information file 234 (FIG. 9) is recorded on the recording medium 41.

  The line video output unit 24 is a so-called output interface to which an external video device or the like is connected. The line video output unit 24 reads the video data stored in the output buffer 23 and outputs it to a connected video device or the like. The line audio output unit 25 is a so-called output interface, and is connected to an external audio device or the like. The line audio output unit 25 reads the audio data stored in the output buffer 23 and outputs the audio data to a connected audio device or the like.

  The LCD controller 26 acquires video data from the data processing unit 20 via the control unit 11. The LCD controller 26 converts the acquired video data into a video signal for displaying the video on the LCD 27, and supplies the converted video signal to the LCD 27. The LCD 27 displays a video based on the supplied video signal.

  The operation unit 28 is configured by, for example, a button, a switch, or a touch panel, and is operated when the user inputs various commands to the video camera 1, and supplies the input commands to the control unit 11.

  The communication unit 29 communicates directly with an external information processing apparatus, or connects to a network such as a LAN (Local Area Network) or the Internet, communicates with an external information processing apparatus connected to the network, Sends / receives data to / from an external information processing apparatus. For example, the communication unit 29 is a wired communication interface device that supports standards such as IEEE (Institute of Electrical and Electronics Engineers) 1394, USB (Universal Serial Bus), or IEEE (Institute of Electrical and Electronic Engineers) 802.11 (802.11a). , 802.11b, 802.11g, etc.) are configured by wireless communication interface devices that comply with standards such as a wireless LAN (Local Area Network) standard.

  FIG. 2 is a block diagram illustrating an example of a functional configuration of the control unit 11 of the video camera 1 of FIG.

The control unit 11 includes a CPU (Central Processing Unit) 61, a ROM (Read Only Memory) 62, a RAM (Random Access Memory) 63, and a clock circuit 64. The CPU 61, ROM 62, RAM 63, and clock circuit 64 are connected to each other via a system bus 65. Further, the camera 12, the input detection unit 17, the input switching unit 18, the data processing unit 20, the memory 21, the drive 22, the LCD controller 26, the operation unit 28, and the communication unit 29 are connected to the system bus 65.

  The CPU 61 executes a predetermined program stored in the ROM 62. The CPU 61 acquires a command input by the user operating the operation unit 28 via the system bus 65, and controls each unit of the video camera 1 according to the command.

  The ROM 62 stores various programs executed by the CPU 61, data necessary for processing, and the like. The ROM 62 stores content data to be recorded in addition to the AV data recorded on the recording medium 41.

  The RAM 63 temporarily stores parameters and data that change as appropriate during the execution of the CPU 61. The RAM 63 may store the program.

  The clock circuit 64 is a so-called real-time clock, and supplies, for example, data indicating the current date, time, day of the week, and the like indicating the shooting date and time to each unit of the video camera 1 via the system bus 65.

  FIG. 3 is a block diagram illustrating an example of a functional configuration of the camera 12 of the video camera 1 of FIG.

  The camera 12 includes a timing generation circuit 81, an optical block driver 82, an optical block 83, a CCD (Charge Coupled Devices) driver 84, a CCD 85, and a preprocessing circuit 86.

  The timing generation circuit 81 generates a timing signal that specifies the timing at which the CCD 85, the optical block driver 82, and the CCD driver 84 operate under the control of the control unit 11, and the generated timing signal is the CCD 85 and the optical block driver 82. , And the CCD driver 84.

  The optical block driver 82 generates a drive signal for operating the optical block 83 based on the timing signal supplied from the timing generation circuit 81 under the control of the control unit 11, and sends the generated drive signal to the optical block 83. Supply.

  The optical block 83 includes a lens, a focus mechanism, a shutter mechanism, a diaphragm (iris) mechanism, and the like. The optical block 83 controls the focus mechanism, the shutter mechanism, the aperture mechanism, and the like based on the drive signal supplied from the optical block driver 82, captures the subject image, and forms the captured image on the CCD 85.

  The CCD driver 84 generates a drive signal for driving the CCD 85 based on the timing signal supplied from the timing generation circuit 81, and supplies the generated drive signal to the CCD 85.

  The CCD 85 photoelectrically converts the image formed by the optical block 83 based on the drive signal supplied from the CCD driver 84 and the timing signal supplied from the timing generation circuit 81, and is a video signal that is an analog electric signal. Is generated. The CCD 85 outputs a generated video signal based on the drive signal supplied from the CCD driver 84 and the timing signal supplied from the timing generation circuit 81. The CCD 85 supplies the generated video signal to the preprocessing circuit 86.

  The pre-processing circuit 86 performs CDS (Correlated Double Sampling) processing on the video signal supplied from the CCD 85 to remove noise from the video signal. The pre-processing circuit 86 performs AGC (Automatic Gain Control) processing on the CDS-processed video signal to control the gain of the video signal. Then, the preprocessing circuit 86 A / D converts the video signal to generate video data of the digital signal, and supplies the generated video data to the input detection unit 17.

  FIG. 4 is a block diagram illustrating an example of a functional configuration of the data processing unit 20 of the video camera 1 of FIG.

  The data processing unit 20 includes a video processing unit 101, an audio processing unit 102, an image processing unit 103, a memory 104, a multiplexer 105, and a demultiplexer 106.

  The video processing unit 101 includes, for example, a DSP (Digital Signal Processor) or a dedicated MPEG (Moving Picture Experts Group) 2 compression / decompression circuit. The video processing unit 101 acquires video data stored in the input buffer 19. The video processing unit 101 acquires information indicating the recording mode from the control unit 11. The video processing unit 101 adjusts the compression rate or bit rate according to the recording mode, and converts the video data with the adjusted compression rate or bit rate, such as MPEG2, MPEG7, motion JPEG (Joint Photographic Experts Group), etc. Encode to video data of the format. The video processing unit 101 supplies the encoded video data to the multiplexer 105.

  Further, the video processing unit 101 acquires video data from the control unit 11, the memory 21, or the demultiplexer 106. The video processing unit 101 performs data processing such as encoding (decoding) and decoding (decoding) on the acquired video data as necessary. The video processing unit 101 supplies video data subjected to data processing to the control unit 11, the memory 21, the output buffer 23, or the multiplexer 105 as necessary. Further, the video processing unit 101, as necessary, adds AF (Auto Focus) for adjusting so-called blur, AE (Auto Exposure) for adjusting image brightness, and AWB for adjusting so-called white balance to the acquired video data. Perform video processing such as (Auto White Balance).

  The audio processing unit 102 is configured by a DSP, for example. The sound processing unit 102 acquires sound data stored in the input buffer 19. The video processing unit 101 acquires information indicating the recording mode from the control unit 11. The audio processing unit 102 adjusts the compression rate or the bit rate according to the recording mode based on the information indicating the recording mode, and converts the audio data with the adjusted compression rate or bit rate, for example, AC3 (Audio Code Number). 3) Encode to audio data of a method such as AAC (Advanced Audio Coding). The video processing unit 101 supplies the encoded video data to the multiplexer 105.

  In addition, the audio processing unit 102 acquires audio data from the control unit 11, the memory 21, or the demultiplexer 106. The audio processing unit 102 performs data processing such as encoding or decoding on the acquired audio data as necessary. The audio processing unit 102 supplies the audio data subjected to the data processing to the control unit 11, the memory 21, the output buffer 23, or the multiplexer 105 as necessary.

  The image processing unit 103 is configured by a DSP, for example. The image processing unit 103 acquires image data from the control unit 11 or the memory 21. The image processing unit 103 performs data processing such as encoding or decoding on the acquired image data, for example, JPEG (Joint Photographic Coding Experts Group) method or PNG (Portable Network Graphics) method, as necessary. The image processing unit 103 supplies the image data subjected to the data processing to the control unit 11, the memory 21, or the output buffer 23 as necessary.

  The memory 104 temporarily stores data generated by the processing of the video processing unit 101, the audio processing unit 102, and the image processing unit 103.

  The multiplexer 105 multiplexes the video data supplied from the video processing unit 101 and the audio data supplied from the audio processing unit 102 to generate AV data. The multiplexer 105 supplies the generated AV data to the control unit 11 or the memory 21 as necessary.

  The demultiplexer 106 separates the AV data acquired from the control unit 11 or the memory 21 into video data and audio data. The demultiplexer 106 supplies the video data obtained by separating the AV data to the video processing unit 101 and supplies the audio data to the audio processing unit 102.

  FIG. 5 is a block diagram illustrating an example of a functional configuration realized by the CPU 61 that executes a recording control program. When the CPU 61 executes the program, an input control unit 121, a data processing control unit 122, a recording control unit 123, a read control unit 124, a display control unit 125, and an output control unit 126 are realized.

  The input control unit 121 detects an input path of video data or audio data based on a detection signal supplied from the input detection unit 17 via the system bus 65, and performs data processing control on information indicating the detected input path. To the unit 122. When video data is supplied from both the camera 12 and the line video input unit 15 to the input switching unit 18 via the input detection unit 17, the input control unit 121 controls the input switching unit 18. Thus, the video data supplied from the camera 12 is supplied to the input buffer 19. Furthermore, when audio data is supplied from both the A / D converter 14 and the line audio input unit 16 to the input switching unit 18 via the input detection unit 17, the input control unit 121 is 18 is controlled so that the audio data supplied from the A / D converter 14 is supplied to the input buffer 19.

  Further, the input control unit 121 controls the communication unit 29 and is connected to the network via another information processing apparatus connected to the communication unit 29 or a network connected to the communication unit 29. Data is received from another information processing apparatus, and the received data is supplied to each unit via the system bus 65.

  The data processing control unit 122 sets the recording mode based on the information indicating the input path supplied from the input control unit 121, and sends the information indicating the set recording mode via the system bus 65 to the video processing unit 101. And supplied to the audio processing unit 102.

  The recording control unit 123 controls the drive 22 to record AV data or content data on the recording medium 41 based on a format described later with reference to FIGS. 6 and 7. Further, the recording control unit 123 updates the file management information of the recording medium 41 and generates and updates the movie information file 234. The recording control unit 123 supplies the file management information and the movie information file 234 (FIG. 9) to the drive 22 via the system bus 65. The recording control unit 123 controls the drive 22 to cause the drive 22 to record the supplied file management information and movie information file 234 on the recording medium 41. Furthermore, the recording control unit 123 acquires an AV data recording stop or audio data recording stop command input by the user operating the operation unit 28 via the system bus 65.

  The read control unit 124 controls the drive 22 to cause the drive 22 to read AV data or content data recorded on the recording medium 41 and supply the read AV data or content data to the memory 21. . Further, the read control unit 124 controls the drive 22 to cause the drive 22 to read the file management information and the movie information file 234 (FIG. 9) recorded on the recording medium 41. The read control unit 124 controls the drive 22 to supply the read file management information and movie information file 234 (FIG. 9) to the RAM 63 via the system bus 65.

  The display control unit 125 controls the LCD controller 26 to display an image based on the image data on the LCD 27.

  The output control unit 126 controls the line video output unit 24 to output the video data stored in the output buffer 23 to an external video device or the like connected to the line video output unit 25. The output control unit 126 also controls the line audio output unit 25 to output the audio data stored in the output buffer 23 to an external audio device or the like connected to the line audio output unit 25. Further, the output control unit 126 controls the communication unit 29, and other information processing apparatuses connected to the communication unit 29 or other networks connected to the network via the network connected to the communication unit 29. Let the information processing apparatus transmit AV data, video data, audio data, image data, and the like.

  Next, with reference to FIG. 6 to FIG. 9, a data recording method on the recording medium 41 of the video camera 1 will be described.

  FIG. 6 is a diagram schematically showing the recording format of the recording medium 41. Note that AV data is recorded from the left to the right in the figure.

  AV data is recorded on the recording medium 41 as stream units 222-1 to 222-n divided every predetermined reproduction time (for example, 10 seconds). Hereinafter, the stream units 222-1 to 222-n are simply referred to as stream units 222 when it is not necessary to individually distinguish them. The bit rate for recording the stream unit 222 has an upper limit. When the stream unit 222 (AV data) is recorded on the recording medium 41, the stream unit 222 (AV data) is recorded as described later with reference to FIG. The stream unit 222 is recorded on the recording medium 41 by adjusting the balance between the bit rates of the video data and the audio data included in ().

  In addition, when the stream units 222-1 to 222-n are recorded on the recording medium 41, an auxiliary space that is a free space having a predetermined recording capacity (eg, 320 kbytes) for recording content data related to each stream unit 222. Areas 221-1 to 222-n are secured immediately before each stream unit 222 and adjacent to each stream unit 222. Hereinafter, the auxiliary regions 221-1 to 221-n are simply referred to as auxiliary regions 221 when it is not necessary to distinguish them individually. Each set of the stream units 222-1 to 222-n and the auxiliary areas 221-1 to 221-n is arranged in continuous recording areas 211-1 to 211-n, which are continuous areas of the recording medium 41. Hereinafter, the continuous recording areas 211-1 to 211-n are simply referred to as a continuous recording area 211 when it is not necessary to distinguish them individually.

  That is, when each stream unit 222 is recorded on the recording medium 41, first, a free area that is equal to or larger than the recording capacity of the continuous recording area 211 is searched, the stream unit 222 is recorded in the searched free area, and the stream unit is recorded. An auxiliary region 221 is secured adjacent to the front of 222. Note that the continuous recording areas 211-1 to 211-n are not necessarily arranged in a continuous area of the recording medium 41, and the positional relationship between the continuous recording areas 211-1 to 211-n is arbitrary. .

  Hereinafter, all the data and files related to the AV data recorded on the recording medium 41 in one recording process, for example, the process from when the user starts photographing with the video camera 1 to when it finishes are collectively recorded as one recording unit. Called. For example, one recording unit includes a stream unit 222 as an AV file 201, content data recorded in the auxiliary area 221, an AV file 201, an auxiliary area file 202, a PNG file 231 (FIG. 7), and a JPEG file 232, which will be described later. (FIG. 7), an audio file 233 (FIG. 7), and a movie information file 234 (FIG. 8) are included.

  The stream units 222-1 to 222-n in one recording unit are managed as an AV file 201 that is one logical file. Specifically, first, a unique track ID is assigned to the AV file 201. For the stream unit 222, information including the track ID of the AV file 201 including the stream unit 222, the start address on the recording medium 41 on which each stream unit 222 is recorded, and the data amount of each stream unit 222 is provided. Are recorded in the file management information of the recording medium 41. Therefore, by referring to the file management information of the recording medium 41, the position and data amount of the AV data recorded in all the stream units 222 included in the AV file 201, that is, one recording unit, on the recording medium 41 are determined. I understand.

  Similarly to the stream unit 222, the free areas of the auxiliary areas 221-1 to 221-n in one recording unit are managed as an auxiliary area file 202 which is one logical file. Specifically, first, a unique track ID is assigned to the auxiliary area file 202. For each auxiliary area 221, information including the track ID of the auxiliary area file 202, the start address on the recording medium 41 in the free area of the auxiliary area 221, and the recording capacity of the free area in the auxiliary area 221 is stored in the recording medium 41. Recorded in file management information. Accordingly, by referring to the file management information of the recording medium 41, the positions and recording capacities of the free areas of all the auxiliary areas 221 included in the auxiliary area file 202 can be known.

  As shown in FIG. 7, content data such as audio data, PNG data, and JPEG data related to the stream unit 222 is recorded in the auxiliary area 221. In other words, content data that is reproduced in synchronization with the stream unit 222 is recorded in the auxiliary area 221. For example, when narration or sound effects are post-recorded on AV data recorded on the recording medium 41, the post-recording audio data is recorded in the auxiliary area 221 of the stream unit 222 including the area (scene) of the post-recording AV data. The When the after-recorded scene extends over a plurality of stream units 222, the after-recorded audio data is divided and recorded in the auxiliary area 221 of the stream unit 222 including the corresponding scene.

  Similarly, when an animation image (for example, PNG data) or a still image (for example, JPEG data) is superimposed and displayed on the video by the AV file 201, an AV data area (scene) on which the animation image or the still image is superimposed is displayed. ), PNG data, JPEG data, or the like is recorded in the auxiliary area 221 of the stream unit 222.

  In addition, when content data is recorded in the auxiliary area 221, the bit rate or compression of the content data is set so that the content data fits within the recording capacity of the auxiliary area 221, as will be described later with reference to FIGS. The rate is adjusted and encoded, and the encoded content data is recorded.

  Each content data recorded in the auxiliary area 221 is managed as one logical file, like the stream unit 222 and the empty area of the auxiliary area 221. Specifically, for example, in FIG. 7, a unique track ID is assigned to the audio file 233 including the audio data recorded by being divided into the auxiliary areas 221-1 to 221-3. For each audio data recorded in one auxiliary area 221, the track ID of the audio file 233 including the audio data, the start address on the recording medium 41 on which the audio data is recorded, and the amount of audio data ( Information including the amount of audio data recorded in one auxiliary area 221 is recorded in the file management information of the recording medium 41. Therefore, by referring to the file management information of the recording medium 41, the position and data amount of the audio data included in the audio file 233 on the recording medium 41 can be known.

  Further, for example, the PNG data recorded in the auxiliary area 221-1 and the JPEG data recorded in the auxiliary area 221-3 are also one logical file to which a unique track ID is assigned, similarly to the audio data. Are managed as a PNG file 231 and a JPEG file 232. Then, the track ID of the PNG file 231 or JPEG file 232, the start address on the recording medium 41 on which PNG data or JPEG data is recorded, and the data amount of PNG data or JPEG data (recorded in one auxiliary area 221) Information including the amount of audio data) is recorded in the file management information of the recording medium 41.

  Therefore, by referring to the file management information of the recording medium 41, the position and data amount of each content data recorded in the auxiliary area 221 can be known.

  Hereinafter, a generic name of the AV file 201, which is a logical file of data recorded on the recording medium 41, the auxiliary area file 202, the PNG file 231, the JPEG file 232, the audio file 233, and the like is referred to as a data logical file.

  Hereinafter, a minimum unit for managing data such as AV data, audio data, PNG data, and JPEG data recorded on the recording medium 41 is referred to as a sample. The definition and size of the sample depends on the type of data. For example, AV data samples correspond to a predetermined number (for example, one) of GOP (Group Of Picture), and one stream unit 222 includes a plurality of AV data samples. Further, for example, a sample of audio data corresponds to one sampling data generated by sampling an analog audio signal at a predetermined sampling frequency, and the audio data recorded in the auxiliary area 221-1 in FIG. Includes multiple audio data samples. Each sample is assigned a unique sample number, and each sample is identified by the sample number.

  Further, when the stream unit 222 (AV data) is recorded on the recording medium 41, one movie information file 234 shown in FIG. 8 is generated for each recording unit. The movie information file 234 includes an AV data management track 251, an auxiliary area management track 252, an auxiliary area reservation track 253, and auxiliary area management data 254.

  The AV data management track 251 includes information regarding the track ID of the AV file 201, the sample numbers of all AV data samples included in the AV file 201, the data amount of each sample, and the playback time of each sample. Therefore, by referring to the file management information and the AV data management track 251, the position and data amount of each sample of AV data recorded in one recording unit on the recording medium 41 can be known.

  The auxiliary area management track 252 includes information on the sample numbers of all auxiliary area management samples included in auxiliary area management data 254 described later, and the data amount of each auxiliary area management sample. The auxiliary area reserved track 253 includes information regarding the track ID of the auxiliary area file 202, the number of each auxiliary area 221, and the recording capacity of the free area of each auxiliary area 221.

  The auxiliary area management data 254 includes a plurality of auxiliary area management samples. One auxiliary area management sample is generated for one auxiliary area 221 and includes information on content data recorded in one auxiliary area 221. Specifically, the auxiliary area management samples are the track ID of the data logical file of the content data recorded in the auxiliary area 221, the number of samples included in the content data recorded in the auxiliary area 221, and the auxiliary area 221. Among the samples included in the recorded content data, the sample number of the first sample (the smallest sample number) is included.

  For example, when audio data is recorded in the auxiliary area 221, the track ID (eg, 10) of the audio file 233 including the audio data recorded in the auxiliary area 221 is recorded in the auxiliary area management sample. The number of samples of the audio data (for example, 312) and the sample number (for example, 313) of the first sample of the audio data recorded in the auxiliary area 221 are recorded. Therefore, by referring to the auxiliary area management sample, it can be seen that samples of the sample numbers 313 to 615 included in the audio file 233 with the track ID 10 are recorded in the auxiliary area 221.

  When a plurality of pieces of content data are recorded in one auxiliary area 221, information related to all content data recorded in the auxiliary area 221 is recorded in the auxiliary area management sample corresponding to the auxiliary area 221. Is done.

  Further, for example, when audio data is recorded in the auxiliary area 221, a recording data management track 255 is added to the movie information file 234 and recorded as shown in FIG.

  The recording data management track 255 includes the track ID of the audio file 233 generated by recording the audio data, the sample numbers of all the audio data samples included in the audio file 233, the data amount of each sample, and the Contains information about playback time.

  Even when content data other than audio data is recorded in the auxiliary area 221, a recording data management track 255 is added to the movie information file 234 and auxiliary area management is performed in the same manner as when audio data is recorded. Information on the auxiliary area management sample of the data 254 is updated.

  Therefore, by referring to the file management information, the auxiliary area management data 254, and the recording data management track 255 of the recording medium 41, the position of each sample of each content data recorded in the auxiliary area 221 on the recording medium 41 and Know the amount of data.

  Next, AV data recording processing by the video camera 1 that executes the AV data recording control program will be described. This process is started when the user operates the operation unit 28 to instruct the start of the AV data recording process. When the AV data recording process is started, input of video data from the camera 12 or the line video input unit 15 to the input detection unit 17 is started. Also, input of audio data from the microphone 13 to the input detection unit 17 or input of audio data from the line audio input unit 16 to the input detection unit 17 is started via the A / D conversion unit 14.

  FIG. 10 is a flowchart for explaining AV data recording processing by the video camera 1.

  In step S1, the video camera 1 performs a pre-recording process. Specifically, the drive 22 reads file management information from the recording medium 41 under the control of the read control unit 124, and supplies the read file management information to the RAM 63 via the system bus 65. The RAM 63 stores the supplied file management information.

  In step S2, the input control unit 121 acquires a detection signal indicating that video data or audio data has been supplied from the input detection unit 17, and detects an input path of the video data and audio data. The input control unit 121 supplies information indicating the detected input path to the data processing control unit 122.

  In step S3, the data processing control unit 122 sets a recording mode based on the input paths of the video data and the audio data, and sends information indicating the set recording mode to the video processing unit 101 and the audio processing via the system bus 65. To the unit 102.

  For example, there are two recording modes for AV data recording processing: camera mode and line mode. When the video data is input from the camera 12 and the audio data is input from the A / D conversion unit 14 (microphone 13), that is, when the user is shooting with the video camera 1, the data processing control unit 122 Set to camera mode. Further, the data processing control unit 122, when video data is input from the line video input unit 15 and audio data is input from the line audio input unit 16, that is, video data input from an external video device and external When recording audio data input from the audio equipment, the line mode is set.

  The data processing control unit 122 gives priority to the video data input from the camera 12 when the video data is input from both the camera 12 and the line video input unit 15, and the audio data is input to the microphone 13 and the line audio. When the sound is input from both of the units 16, the recording mode is set by giving priority to the sound data input from the microphone 13.

  In step S4, the video processing unit 101 and the audio processing unit 102 encode the video data and the audio data based on the recording mode set in the process of step S3.

  Specifically, the input detection unit 17 supplies video data and audio data to the input switching unit 18. The input switching unit 18 supplies the supplied video data and audio data to the input buffer 19, and the input buffer 19 stores the supplied video data and audio data. When the video data is input from both the camera 12 and the line video input unit 15, the input switching unit 18 selects the video data input from the camera 12, and the audio data is the microphone 13 and the line audio input unit. 16, the audio data input from the microphone 13 is selected, and the selected video data and audio data are supplied to the input buffer 19.

  The video processing unit 101 acquires video data from the input buffer 19, encodes the acquired video data in, for example, the MPEG2 system, and supplies the encoded video data to the multiplexer 105. In addition, the audio processing unit 102 acquires audio data from the input buffer 19, encodes the acquired audio data in, for example, the AC3 system, and supplies the encoded audio data to the multiplexer 105. The multiplexer 105 multiplexes the acquired video data and audio data to generate AV data. The multiplexer 105 supplies the generated AV data to the memory 21, and the memory 21 stores the supplied AV data.

  At this time, as described above, the upper limit of the bit rate of AV data that can be recorded on the recording medium 41 is determined, and the bit rates of the video data and the audio data are adjusted so as to be within the range of the bit rate. Specifically, when the recording mode is set to the camera mode, the video processing unit 101 encodes video data in the MPEG2 format at a maximum bit rate of 9.0 Mbps and supplies the encoded video data to the multiplexer 105, for example. Also, the audio processing unit 102 encodes the audio data into the AC3 system at a bit rate of 64 kbps at the maximum and supplies the encoded audio data to the multiplexer 105, for example.

  When the recording mode is set to the line mode, the video processing unit 101 encodes video data in the MPEG2 format at a maximum bit rate of 8.0 Mbps, for example, and supplies the encoded data to the multiplexer 105. Also, the audio processing unit 102 encodes the audio data into an AC3 format at a bit rate of a maximum of 448 kbps, for example, and supplies the encoded audio data to the multiplexer 105.

  In general, when shooting with the video camera 1, a general user often shoots the video camera 1 by holding it without using a tripod and using the auto-focus function. It is likely to occur frequently. Moreover, a general user has a high possibility of panning the video camera 1 frequently. Therefore, since the change of the image between frames is large, if the video data is encoded at a low bit rate, block noise is likely to occur when the video data is reproduced. On the other hand, the voice data recorded at the time of shooting is mostly human voice input from the microphone 13, and so high quality is not required. Therefore, in the camera mode, it is desirable to suppress the bit rate for recording audio data and increase the bit rate for recording video data.

  On the other hand, most of the video data input from line video input was taken by a professional cameraman, such as video data from a television broadcast. It is. Therefore, even if the video data is encoded with a bit rate lowered to some extent, the quality of the video data does not change much. On the other hand, the voice data input from the line voice input often includes not only human voice but music and the like, and high quality is required to some extent. Therefore, in the line mode, it is desirable to lower the bit rate for recording video data and increase the bit rate for recording audio data.

  Therefore, as described above, in the camera mode, the video data and the audio data are encoded so that the bit rate of the video data is higher and the bit rate of the audio data is lower than in the line mode. On the other hand, in the line mode, the video data and the audio data are encoded so that the bit rate of the video data is lower and the bit rate of the audio data is higher than in the camera mode.

  Note that the user may be able to set an arbitrary recording mode or adjust the bit rate value by operating the operation unit 28 or the like.

  In step S <b> 5, the recording control unit 123 records AV data on the recording medium 41. Specifically, when the amount of AV data stored in the memory 21 becomes equal to or greater than a predetermined amount (for example, reproduction time 10 seconds) to be divided and recorded as the stream unit 222, the drive 22 Under the control of 123, AV data is acquired from the memory 21, and the acquired AV data is recorded as a stream unit 222 in a continuous area of the recording medium 41. At this time, as described above with reference to FIG. 6, the drive 22 secures the auxiliary area 221 before the area for recording the stream unit 222 under the control of the recording control unit 123.

  Further, the recording control unit 123 updates the file management information stored in the RAM 63 based on the recording of AV data on the recording medium 41. Further, the recording control unit 123 generates a movie information file 234 based on the recording of the AV data on the recording medium 41 and supplies the movie information file 234 to the RAM 63, and the RAM 63 stores the supplied movie information file 234.

  In step S6, the recording control unit 123 determines whether an AV data recording stop command has been input. If it is determined that the AV data recording stop command has not been input, the process returns to step S4, and the processing of steps S4 to S6 is performed until it is determined in step S6 that the AV data recording stop command has been input. Repeatedly, the AV data is divided into the stream units 222 and recorded on the recording medium 41.

  In the second and subsequent processing of step S5, the recording control unit 123 updates the content of the movie information file 234 generated in the first processing of step S5 based on the recording of AV data on the recording medium 41. .

  If it is determined in step S6 that an AV data recording stop command has been input, that is, when the user operates the operation unit 28, the AV is sent from the operation unit 28 to the recording control unit 123 via the system bus 65. If it is determined that a data recording stop command has been input, the process proceeds to step S7.

  In step S7, the video camera 1 performs post-recording processing, and the AV data recording processing ends. Specifically, the recording control unit 123 supplies the movie information file 234 stored in the RAM 63 to the drive 22 via the system bus 65. The drive 22 records the movie information file 234 on the recording medium 41 under the control of the recording control unit 123. Further, the recording control unit 123 updates the file management information stored in the RAM 63 based on the recording of the movie information file 234 on the recording medium 41, and sends the updated file management information via the system bus 65. Supply to drive 22. The drive 22 records file management information on the recording medium 41 under the control of the recording control unit 123.

  In this way, video data and audio data are encoded at an appropriate bit rate based on the input path, and AV data in which the encoded video data and audio data are multiplexed is recorded on the recording medium 41.

  Next, content data recording processing for recording content data by the video camera 1 that executes the content data recording control program will be described. This process is started when the user operates the operation unit 28 to instruct the start of the content data recording process. When the content data recording process is started, audio data is input from the microphone 13 to the input detection unit 17 or from the line audio input unit 16 to the input detection unit 17 via the A / D conversion unit 14. Input of audio data is started.

  11 to 13 are flowcharts for explaining content data recording processing by the video camera 1.

  In step S21, the video camera 1 performs a pre-recording process. Specifically, the drive 22 reads the file management information and movie information file 234 from the recording medium 41 under the control of the reading control unit 124, and reads the read file management information and movie information file 234 through the system bus 65. To the RAM 63. The RAM 63 stores the supplied file management information and movie information file 234.

  In step S <b> 22, the data processing control unit 122 determines whether content data (hereinafter referred to as new content data) to be recorded in the auxiliary area 221 is audio data. When the data processing control unit 122 determines that the new content data is audio data (hereinafter referred to as new audio data) based on a content data recording process command input by the user operating the operation unit 28. That is, when new audio data is recorded in the auxiliary area 221 by post-recording processing or the like, the process proceeds to step S23.

  In step S23, the input control unit 121 acquires a detection signal indicating that the audio data has been supplied from the input detection unit 17, and detects an input path of the audio data. The input control unit 121 supplies information indicating the detected input path to the data processing control unit 122.

  In step S24, the data processing control unit 122 investigates the usage status of the auxiliary area 221 based on the file management information and the movie information file 234, and records it in one auxiliary area 221 for the recording capacity of the auxiliary area 221. The ratio of the amount of new audio data that can be recorded (hereinafter referred to as the new audio data recording ratio) is set. As will be described later, in order to record new audio data, at least a quarter of the recording capacity of the auxiliary area 221 is required, so the minimum value of the new audio data recording ratio is 1/4. .

  For example, when there is no auxiliary area 221 in which content data is recorded, that is, when content data that is audio data is first recorded in the auxiliary area 221, the data processing control unit 122 sets a new audio data recording ratio. Set to 3/4. As a result, at least a quarter of the recording capacity of the auxiliary area 221 is secured so that another content data can be added and recorded later.

  Further, for example, when there is at least one auxiliary area 221 in which content data is recorded and the content data already recorded (hereinafter referred to as existing content data) is only audio data, the data processing control unit 122 In all the auxiliary areas 221, the new audio data recording ratio is set so that the amount of audio data to be recorded is 3/4 or less of the recording capacity of the auxiliary area 221. As a result, at least a quarter of the recording capacity of the auxiliary area 221 is secured so that other content data other than the audio data can be added and recorded later. Hereinafter, of the existing content data, the audio data is referred to as existing audio data, and the existing content data other than the audio data is referred to as existing non-audio data.

  For example, in the auxiliary area 221 in which only the existing audio data is recorded in the auxiliary area 221 and the ratio of the data amount of the existing audio data to the recording capacity of the auxiliary area 221 is the largest, the data amount of the existing audio data is the auxiliary volume. When the recording capacity of the area 221 is equal to or less than ¼, the data processing control unit 122 sets the new audio data recording ratio to ½. Further, for example, in the auxiliary area 221 in which only the existing audio data is recorded in the auxiliary area 221 and the ratio of the data amount of the existing audio data to the recording capacity of the auxiliary area 221 is the largest, the data amount of the existing audio data is When the recording capacity of the auxiliary area 221 is greater than 1/4 and less than or equal to 1/2, the data processing control unit 122 sets the new audio data recording ratio to 1/4.

  Further, for example, in the auxiliary area 221 in which only the existing audio data is recorded in the auxiliary area 221 and the ratio of the data amount of the existing audio data to the recording capacity of the auxiliary area 221 is the largest, the data amount of the existing audio data is When the recording capacity of the auxiliary area 221 is larger than one half, the data processing control unit 122 counts the number of audio files 233 of existing audio data recorded in the auxiliary area 221 (the number of types of audio data) When the number of tracks is 2 or less, the new audio data recording ratio is set to 1/4, and when the number of tracks of existing audio data recorded in the auxiliary area 221 is 3 or more, new audio data is recorded. The data recording ratio is set to 0, which is a value indicating that new audio data cannot be recorded. In other words, up to three tracks of audio data can be recorded in the auxiliary area 221.

  For example, when there is only one auxiliary area 221 in which content data is recorded and only existing non-speech data is recorded, the data processing control unit 122 sets the existing capacity for the recording capacity of the auxiliary area 221. In the auxiliary area 221 where the ratio of the amount of non-audio data is the maximum, when the data amount of the existing non-audio data is less than or equal to ¼ of the recording capacity of the auxiliary area 221, the new audio data recording ratio is set to 3/4 When the data amount of the existing non-audio data is larger than a quarter of the recording capacity of the auxiliary area 221 and less than a half, the new audio data recording ratio is set to a half. When the amount of audio data is larger than half of the recording capacity of the auxiliary area 221, the new audio data recording ratio is set to 1/4.

  Furthermore, for example, when there is at least one auxiliary area 221 in which content data is recorded and both existing audio data and existing non-audio data are recorded, the data processing control unit 122 records the recording capacity of the auxiliary area 221. In the auxiliary area 221 where the ratio of the data amount of the existing content data is the largest, if the data amount of the existing content data is less than or equal to half the recording capacity of the auxiliary area 221, the new audio data recording ratio is When the number of existing content data is larger than one half of the recording capacity of the auxiliary area 221, the new audio data recording ratio is set to four minutes when the number of existing audio data tracks is two or less. When 1 is set and the number of tracks of existing audio data is 3 or more, the new audio data recording ratio is set to 0.

  Note that the number of tracks of audio data that can be recorded in the auxiliary area 221 can be increased by reducing the minimum value of the amount of audio data recorded in the auxiliary area 221. The above-described new audio data recording ratio is an example of the new audio data ratio, and can be set to other values as a matter of course. Further, the user may be able to set a new voice ratio.

  In step S <b> 25, the data processing control unit 122 determines whether new audio data can be added to the auxiliary area 221 and recorded. If it is determined that new audio data can be added and recorded, that is, if the new audio data recording ratio is set to a value greater than 0 in the process of step S24, the process proceeds to step S26.

  In step S <b> 26, the data processing control unit 122 sets a recording mode for audio data, and supplies information indicating the set recording mode to the audio processing unit 102.

  For example, there are three modes for recording audio data in the auxiliary area 221: a high quality mode, a standard mode, and a compact mode. The high quality mode is a mode for recording audio data by encoding the audio data at the highest bit rate. The bit rate of the high quality mode is such that the amount of encoded audio data is, for example, 4 of the recording capacity of the auxiliary area 221 so that other content data such as image data can be added to the auxiliary area 221 later and recorded. The data amount is set to 3 or less of a minute. For example, if the recording capacity of one auxiliary area 221 is 320 kbytes and audio data of up to 10 seconds can be recorded in one auxiliary area 221, the bit rate of the audio data in the high quality mode is 192 kbps (= 320 kbyte × 8 bit × 3/4 ÷ 10 seconds).

  The standard mode is a mode for recording audio data by encoding the audio data at a bit rate between the high quality mode and the compact mode. The bit rate of the standard mode is set so that the data amount of the encoded audio data is, for example, a data amount that is half or less of the recording capacity of the auxiliary area 221. For example, when the recording capacity of one auxiliary area 221 is 320 kbytes and audio data of up to 10 seconds can be recorded in one auxiliary area 221, the bit rate of the audio data in the standard mode is 128 kbps (= 320 kbyte × 8 bit × 1) / 2 ÷ 10 seconds).

  The compact mode is a mode for recording audio data by encoding audio data at the lowest bit rate. The bit rate of the compact mode is set so that the data amount of the encoded audio data is, for example, a data amount that is ¼ or less of the recording capacity of the auxiliary area 221. For example, if the recording capacity of one auxiliary area 221 is 320 kbytes and audio data of up to 10 seconds can be recorded, the maximum bit rate of audio data in the compact mode is 64 kbps (= 320 kbytes x 8 bits x 1/4 divided by 10 seconds) It becomes.

  When new voice data is input from the line voice input unit 16, there is a high possibility that music or the like is included in the new voice data, and high sound quality is required. Therefore, the data processing control unit 122 sets the recording mode to high quality. Set to mode. However, when the new audio data recording ratio is smaller than three quarters, that is, when new audio data is recorded in the high quality mode, if there is a possibility that the recording capacity of the auxiliary area 221 is insufficient, the data processing control unit 122 When the new audio data recording ratio is more than 1/2 or less than 3/4, the recording mode is set to the standard mode, and when the new audio data recording ratio is less than 1/2, the recording mode is set to the compact mode. Set to.

  Further, when new voice data is input from the microphone 13, the new voice data is mostly human voice and does not require so high sound quality, the data processing control unit 122 sets the recording mode to the standard mode. . However, when the new audio data recording ratio is smaller than half, that is, when new audio data is recorded in the standard mode, if the recording capacity of the auxiliary area 221 may be insufficient, the data processing control unit 122 Set the recording mode to compact mode.

  Note that the user may set an arbitrary recording mode or adjust the bit rate value for encoding audio data by operating the operation unit 28 or the like. In addition, when audio data is input from an external microphone other than the microphone 13 via a microphone terminal (not shown), the recording mode is increased, for example, in distinction from when audio data is input from the microphone 13. The quality mode may be set.

  In step S27, the data processing control unit 122 sets the new content data (in this case, new audio data) and the data of the existing content data recorded in the auxiliary area 221 for recording the new content data with respect to the recording capacity of the auxiliary area 221. An amount ratio (hereinafter referred to as a data amount ratio) is set. That is, the ratio of the data amount of each content data recorded in the auxiliary area 221 is set.

  Specifically, the data processing control unit 122 examines the existing content data recorded in the auxiliary area 221 in which new audio data is recorded next based on the file management information and the movie information file 234, and determines the data amount. Set the ratio.

  When the existing content data is not recorded in the auxiliary area 221, the data processing control unit 122 sets the data amount ratio of the new audio data based on the recording mode. For example, when the recording mode is set to the high quality mode, the data processing control unit 122 sets the data amount ratio of the new audio data to 3/4 of the recording capacity of the auxiliary area 221, and the recording mode is the standard mode. Is set to 1/2 of the recording capacity of the auxiliary area 221, and when the recording mode is set to the compact mode, the data volume ratio of the new audio data is set to The recording capacity of the auxiliary area 221 is set to ¼.

  When only the existing audio data is recorded in the auxiliary area 221, the data processing control unit 122 sets the data amount ratio between the new audio data and the existing audio data based on the recording mode. For example, when only the existing audio data is recorded in the auxiliary area 221 and the recording mode is set to the standard mode, the data processing control unit 122 records the data amount ratio of the new audio data in the auxiliary area 221. The data volume ratio of the existing audio data is set to ¼ of the recording capacity of the auxiliary area 221.

  For example, when only the existing audio data is recorded in the auxiliary area 221 and the recording mode is set to the compact mode, the data processing control unit 122 sets the data amount ratio of the new audio data to the auxiliary area 221. Is set to one-fourth of the recording capacity, and the data amount ratio of the existing audio data is set to one-half of the recording capacity of the auxiliary area 221. At this time, when the number of tracks of the existing audio data is two, the data processing control unit 122 sets the data amount ratio of each existing audio data to ¼ of the recording capacity of the auxiliary area 221.

  When only the existing non-voice data is recorded in the auxiliary area 221, the data processing control unit 122 sets the data amount ratio between the new voice data and the existing non-voice data based on the recording mode. For example, when only the existing non-audio data is recorded in the auxiliary area 221 and the recording mode is set to the high quality mode, the data processing control unit 122 sets the data amount ratio of the new audio data to the auxiliary area 221. Is set to three-fourths of the recording capacity, and the data amount ratio of the existing non-voice data is set to one-fourth of the recording capacity of the auxiliary area 221.

  For example, when only the existing non-voice data is recorded in the auxiliary area 221 and the recording mode is set to the standard mode, the data processing control unit 122 sets the data amount ratio of the new voice data to the auxiliary area. The recording capacity of the non-voice data is set to one half of the recording capacity of the auxiliary area 221. Further, for example, when only the existing non-audio data is recorded in the auxiliary area 221 and the recording mode is set to the compact mode, the data processing control unit 122 sets the data amount ratio of the new audio data to the auxiliary area. The data capacity ratio of the existing non-voice data is set to 3/4 of the recording capacity of the auxiliary area 221.

  When both the existing voice data and the existing non-voice data are recorded in the auxiliary area 221, the data processing control unit 122 determines the data amount of the new voice data, the existing voice data, and the existing non-voice data based on the recording mode. Set the ratio. For example, when both the existing voice data and the existing non-voice data are recorded in the auxiliary area 221 and the recording mode is set to the standard mode, the data processing control unit 122 sets the data amount ratio of the new voice data. Is set to ½ of the recording capacity of the auxiliary area 221, the data amount ratio of the existing audio data is set to ¼ of the recording capacity of the auxiliary area 221, and the data amount ratio of the existing non-audio data is set to the auxiliary area Set to ¼ of the recording capacity of 221.

  For example, when both the existing audio data and the existing non-audio data are recorded in the auxiliary area 221, the recording mode is set to the compact mode, and the number of tracks of the existing audio data is one track. The data processing control unit 122 sets the data amount ratio of the new audio data to ¼ of the recording capacity of the auxiliary area 221, and sets the data amount ratio of the existing audio data to one half of the recording capacity of the auxiliary area 221. And the data amount ratio of the existing non-voice data is set to ¼ of the recording capacity of the auxiliary area 221.

  Further, for example, when both the existing audio data and the existing non-audio data are recorded in the auxiliary area 221, the recording mode is set to the compact mode, and the number of tracks of the existing audio data is 2 tracks. The data processing control unit 122 sets the data amount ratio of the new audio data to ¼ of the recording capacity of the auxiliary area 221, and sets the data amount ratio of the existing audio data to ¼ of the recording capacity of the auxiliary area 221. 1 is set, and the data amount ratio of the existing non-voice data is set to ¼ of the recording capacity of the auxiliary area 221.

  In step S28, the audio processing unit 102 encodes new audio data. Specifically, the input detection unit 17 supplies new voice data to the input switching unit 18. The input switching unit 18 supplies the supplied new audio data to the input buffer 19, and the input buffer 19 stores the supplied new audio data. The input switching unit 18 selects the new audio data input from the microphone 13 and inputs the selected new audio data when the new audio data is input from both the microphone 13 and the line audio input unit 16. This is supplied to the buffer 19.

  The audio processing unit 102 acquires new audio data from the input buffer 19, adjusts the bit rate and the like according to the recording mode based on the information indicating the recording mode, and converts the new audio data at the adjusted bit rate, For example, the encoded audio data is supplied to the memory 21 after being encoded into the AC3 system. The memory 21 stores the supplied new audio data.

  In step S29, the data processing control unit 122 determines whether the existing content data needs to be re-encoded. Specifically, the data processing control unit 122 determines that the data amount of the existing content data recorded in the auxiliary area 221 for recording the new audio data based on the file management information and the movie information file 234 is the processing in step S27. It is determined whether or not the amount of data is equal to or less than the data amount ratio set in step S2. For example, the data amount ratio of existing audio data or existing non-audio data recorded in the auxiliary area 221 is set to 1/4, and the data amount of existing audio data or existing non-audio data actually recorded is set. Is larger than a quarter of the recording capacity of the auxiliary area 221, it is determined that the existing content data needs to be re-encoded.

  If it is determined in step S29 that it is not necessary to re-encode the existing content data, including the case where the existing content data is not recorded in the auxiliary area 221 for recording the new audio data, the process proceeds to step S30.

  In step S <b> 30, the recording control unit 123 records new audio data in the auxiliary area 221 of the recording medium 41. Specifically, when the amount of new audio data recorded in the memory 21 exceeds a predetermined amount (for example, a reproduction time of 10 seconds) that is divided and recorded in one auxiliary area 221, the drive 22 Under the control of the recording control unit 123, new audio data is acquired from the memory 21, and the acquired new audio data is recorded in the auxiliary area 221 of the recording medium 41. That is, only the new audio data is recorded in the auxiliary area 221.

  At this time, as described above, even when the high-quality mode with the highest bit rate is set, the new voice data is set so that the data amount of the new voice data is three-fourths or less of the recording capacity of the auxiliary area 221. Since the data is encoded, at least an area corresponding to a quarter of the recording capacity of the auxiliary area 221 is free so that other content data such as image data can be added later and recorded in the auxiliary area 221. Secured as an area. Thereafter, the process proceeds to step S37.

  If it is determined in step S29 that the existing content data needs to be re-encoded, the process proceeds to step S31.

  In step S31, as in the process of step S29, the data processing control unit 122 determines whether or not the existing audio data needs to be re-encoded. If it is determined that the existing audio data needs to be re-encoded, the process proceeds to step S32.

  In step S32, the audio processing unit 102 re-encodes existing audio data. Specifically, the drive 22 reads the existing audio data from the auxiliary area 221 of the recording medium 41 that records the new content data under the control of the read control unit 124, and supplies the read existing audio data to the memory 21. . The memory 21 stores the supplied existing audio data.

  The data processing control unit 122 sets the recording mode so that the data amount of the existing audio data is equal to or less than the data amount based on the data amount ratio set in step S27, and the information indicating the set recording mode is recorded as audio. This is supplied to the processing unit 102. For example, when the data amount ratio of the existing audio data is set to ¼ of the recording capacity of the auxiliary area 221, the data processing control unit 122 sets the recording mode to the compact mode.

  The audio processing unit 102 acquires existing audio data from the memory 21 and decodes the acquired existing audio data. Then, the audio data processing unit 103 adjusts the bit rate according to the recording mode based on the information indicating the recording mode, re-encodes the decoded existing audio data at the adjusted bit rate, and re-encodes the existing audio data Is supplied to the memory 21. The memory 21 stores the supplied existing audio data. When existing audio data of two or more tracks is recorded in the auxiliary area 221 for recording new audio data, re-encoding is performed on all existing audio data.

  If it is determined in step S31 that it is not necessary to re-encode the existing audio data, including the case where the existing audio data is not recorded in the auxiliary area 221 for recording the new audio data, the process of step S32 is skipped. The process proceeds to step S33.

  In step S33, as in the process of step S29, the data processing control unit 122 determines whether or not the existing non-voice data needs to be re-encoded. If it is determined that the existing non-voice data needs to be re-encoded, the process proceeds to step S34.

  In step S34, the image processing unit 103 re-encodes the existing non-audio data. Specifically, the drive 22 reads the existing non-voice data from the auxiliary area 221 of the recording medium 41 that records the new voice data under the control of the read control unit 124, and stores the read existing non-voice data in the memory 21. Supply. The memory 21 stores the supplied existing non-voice data.

  The image processing unit 103 acquires the existing non-audio data from the memory 21 and decodes it, and then re-encodes the decoded existing non-audio data at a higher compression rate. When a plurality of existing non-voice data is recorded in the auxiliary area 221 for recording new voice data, re-encoding is performed for all the existing non-voice data.

  In step S35, the data processing control unit 122 determines whether or not the total data amount of the existing non-voice data is equal to or less than the data amount based on the data amount ratio set in step S27. When it is determined that the total data amount of the existing non-voice data is larger than the data amount based on the data amount ratio, the process returns to step S34, and in step S35, the total data amount of the existing non-voice data is the data amount ratio. Steps S34 and S35 are repeated until it is determined that the amount of data is less than or equal to the above. That is, the process of re-encoding existing non-voice data at a higher compression rate is repeated until the total amount of existing non-voice data becomes equal to or less than the data quantity based on the data amount ratio.

  If it is determined in step S35 that the total data amount of the existing non-voice data is equal to or less than the data amount based on the data amount ratio, the process proceeds to step S36.

  If it is determined in step S33 that it is not necessary to re-encode the existing non-speech data including the case where the existing non-speech data is not recorded in the auxiliary area 221 in which the new speech data is recorded, the steps S34 and S35 are performed. The process is skipped and the process proceeds to step S36.

  Note that the processing of steps S31 to S35 can reduce the data amount of the existing content data, and can increase the recording capacity of the free area of the auxiliary area 221.

  In step S <b> 36, the recording control unit 123 records new audio data and existing content data in the auxiliary area 221 of the recording medium 41. Specifically, when the amount of new audio data recorded in the memory 21 exceeds a predetermined amount (for example, a reproduction time of 10 seconds) that is divided and recorded in one auxiliary area 221, the drive 22 Under the control of the recording control unit 123, new audio data and re-encoded existing content data are acquired from the memory 21, and the acquired new audio data and existing content data are overwritten on the existing content data already recorded. To be recorded in the auxiliary area 221 of the recording medium 41.

  Further, the recording control unit 123 updates the file management information and the movie information file 234 stored in the RAM 63 based on the recording of the content data in the auxiliary area 221.

  In step S37, the recording control unit 123 determines whether or not a voice data recording stop command is input. If it is determined that the voice data recording stop command is not input, the process returns to step S27, and the processing of steps S27 to S37 is performed until it is determined in step S37 that the voice data recording stop command is input. Repeated.

  In step S37, when it is determined that a voice data recording stop command has been input, that is, when the user operates the operation unit 28, the recording control unit 123 stops the recording of the voice data via the system bus 65. If a command is input, the process proceeds to step S38.

  In step S38, the video camera 1 performs post-recording processing as in step S7 of FIG. 10, and the content data recording processing ends.

  If it is determined in step S25 that new voice data cannot be recorded by adding to the auxiliary area 221, that is, if the new voice data recording ratio is set to 0 in the process of step S24, the new voice data is stored in the auxiliary area. The process proceeds to step S38 without being recorded in 221. In step S38, a post-recording process is performed, and the content data recording process ends. At this time, the user may be notified that new audio data cannot be recorded, for example, by displaying on the LCD 27.

  If it is determined in step S22 that the new content data is not audio data, the process proceeds to step S39.

  In step S39, as in step S27, the data processing control unit 122 sets the data amount ratio of content data to be recorded in the auxiliary area 221. Specifically, the data processing control unit 122 investigates the existing content data recorded in the auxiliary area 221 for recording new content data based on the file management information and the movie information file 234, and determines the data amount ratio. Set.

  For example, when the existing content data is not recorded in the auxiliary area 221, the data processing control unit 122 sets the data amount ratio of the new content data to 3/4 of the recording capacity of the auxiliary area 221. As a result, at least a quarter of the recording capacity of the auxiliary area 221 is secured so that another content data can be added and recorded later.

  For example, when only existing audio data is recorded in the auxiliary area 221 and the amount of new content data is less than or equal to the recording capacity of the free area of the auxiliary area 221, that is, the new content data can be recorded as it is without being encoded. The data processing control unit 122 sets the ratio of the amount of new content data to the ratio (ratio) of the recording capacity of the free area of the auxiliary area 221 to the recording capacity of the auxiliary area 221.

  For example, when only the existing audio data is recorded in the auxiliary area 221 and the data amount of the new content data is larger than the recording capacity of the empty area of the auxiliary area 221, the data processing control unit 122 determines that the number of tracks of the existing audio data is For one track, the data amount ratio of new content data is set to one half of the recording capacity of the auxiliary area 221, and the data amount ratio of existing audio data is set to one half of the recording capacity of the auxiliary area 221. When the number of tracks of the existing audio data is 2, the data amount ratio of the new content data is set to one half of the recording capacity of the auxiliary area 221, and the data amount ratio of the existing audio data is set in the auxiliary area 221. When the capacity is set to 1/4 and the number of tracks of existing audio data is 3, the ratio of the amount of new content data is an auxiliary area. Set to one quarter of the recording capacity of 21, to set the data amount ratio of the existing voice data to a quarter of the recording capacity of each auxiliary area 221.

  For example, when only the existing non-audio data is recorded in the auxiliary area 221, the data processing control unit 122 calculates the total amount of new content data and existing non-audio data, that is, the amount of content data other than audio data. The total data amount ratio is set to 3/4 of the recording capacity of the auxiliary area 221. As a result, at least a quarter of the recording capacity of the auxiliary area 221 is secured so that audio data can be added and recorded later.

  For example, when both the existing audio data and the existing non-audio data are recorded in the auxiliary area 221, and the data amount of the new content data is less than or equal to the recording capacity of the free area of the auxiliary area 221 in which the new content data is recorded, that is, When the new content data can be recorded as it is without being encoded, the data processing control unit 122 sets the total data amount ratio of the new content data and the existing non-audio data to the auxiliary area 221 with respect to the recording capacity of the auxiliary area 221. Is set to the ratio (ratio) occupied by the total of the recording capacity of the free area and the data amount of the existing non-voice data.

  For example, when both the existing audio data and the existing non-audio data are recorded in the auxiliary area 221, and the data amount of the new content data is larger than the recording capacity of the free area of the auxiliary area 221 in which the new content data is recorded, the data processing When the number of tracks of the existing audio data is one track, the control unit 122 sets the total data amount ratio of the new content data and the existing non-audio data to a half of the recording capacity of the auxiliary area 221. When the data volume ratio of the existing audio data is set to ½ of the recording capacity of the auxiliary area 221 and the number of tracks of the existing audio data is 2, the total data amount of the new content data and the existing non-audio data The volume ratio is set to one half of the recording capacity of the auxiliary area 221 and the data volume ratio of the existing audio data is set to the auxiliary area 221 respectively. When the recording capacity is set to 1/4 and the number of tracks of the existing audio data is 3, the total data amount ratio of the new content data and the existing non-audio data is 4 minutes of the recording capacity of the auxiliary area 221. 1 and the data volume ratio of the existing audio data is set to 1/4 of the recording capacity of the auxiliary area 221.

  The data amount ratio described in the processes of steps S27 and S39 is an example of the data amount ratio, and can be set to other values as a matter of course. The data amount ratio may be set by the user, or the data amount ratio may be set based on the data amount of the content data before encoding. Furthermore, in the above example, it is classified into content data other than audio data and audio data, and the data amount ratio is set. However, the content data classification can be changed.

  In step S40, the data processing control unit 122 adds the total amount of new content data and existing non-audio data based on the file management information and the movie information file 234, that is, content other than audio data recorded in the auxiliary area 221. It is determined whether or not the total data amount is equal to or less than the data amount based on the data amount ratio set in step S39. When it is determined that the total amount of the new content data and the existing non-speech data is equal to or less than the data amount based on the data amount ratio, that is, when the new content data can be recorded in the auxiliary area 221 without being encoded, The process proceeds to step S41.

  In step S41, the recording control unit 123 causes the new content data to be recorded in the auxiliary area 221 of the recording medium 41 as in the process of step S30. Thereafter, the process proceeds to step S38, the post-recording process described above is performed, and the content data recording process ends.

  If it is determined in step S40 that the total amount of new content data and existing non-audio data is greater than the data amount based on the data amount ratio, the process proceeds to step S42.

  In step S42, as in the process of step S31, the data processing control unit 122 determines whether or not the existing audio data needs to be re-encoded. If it is determined that the existing audio data needs to be re-encoded, the process proceeds to step S43. In step S43, the audio processing unit 102 records the new audio content data in the same manner as the process of step S32. The existing audio data recorded in the H.221 is re-encoded.

  If it is determined in step S42 that the existing audio data does not need to be re-encoded, the process of step S43 is skipped, and the process proceeds to step S44.

  In step S44, similar to the process in step S34, the image processing unit 103 re-encodes the existing non-audio data recorded in the auxiliary area 221 in which new content data is recorded.

  In step S45, the image processing unit 103 acquires new content data from the memory 21, and encodes the acquired new content data. For example, when the new content data is image data, the image processing unit 103 encodes the new content data in the JPEG format. The image processing unit 103 supplies the encoded new content data to the memory 21, and the memory 21 stores the supplied new content data.

  In step S46, the data processing control unit 122 adds the total data amount of the new content data and the existing non-audio data, that is, the total data amount of the content data other than the audio data to the data amount ratio set in the process of step S39. It is determined whether or not the amount of data is below the basis. When it is determined that the total amount of the new content data and the existing non-audio data is larger than the data amount based on the data amount ratio, the process returns to step S44, and in step S46, the new content data and the existing non-audio data The processes of steps S44 to S46 are repeated until it is determined that the sum of the data amounts is equal to or less than the data amount based on the data amount ratio. That is, the process of re-encoding new content data and existing non-audio data at a higher compression rate is repeated until the total amount of new content data and existing non-audio data becomes equal to or less than the data amount based on the data amount ratio. It is.

  If it is determined in step S46 that the total amount of new content data and existing non-audio data is equal to or less than the data amount based on the data amount ratio, the process proceeds to step S47.

  Note that the amount of existing content data can be reduced by the processing of steps S42 to S46, and the recording capacity of the free area of the auxiliary area 221 can be increased.

  In step S47, the recording control unit 123 causes the new content data and the existing content data to be recorded in the auxiliary area 221 of the recording medium 41 as in the process of step S36.

  Thereafter, the process proceeds to step S38, the post-recording process described above is performed, and the content data recording process ends.

  In this way, when new content data is recorded in the auxiliary area 221, when new content data is first recorded in the auxiliary area 221, another content data can be added and recorded later in the auxiliary area 221. A free area having a recording capacity of a predetermined ratio of the recording capacity of the auxiliary area 221 is secured. When the new content data is audio data, it is encoded at an appropriate bit rate based on the input path and recorded in the auxiliary area 221 of the recording medium 41. Furthermore, when the existing content data is recorded in the auxiliary area 221 and there is no free area in which new content data can be recorded, the existing content data is re-encoded at an appropriate compression rate or bit rate, and the new content data is stored in the auxiliary area 221. And the existing content data is recorded.

  Note that the present invention can be applied to a recording apparatus such as a video camera or a recorder provided with a plurality of input interfaces. A plurality of line video input units 15 or a plurality of line audio input units 16 may be provided, and the recording mode may be set according to the line video input unit 15 or the line audio input unit 16 to which data is input. . Also, when data is input via the communication unit 29, the recording mode may be switched similarly.

  As described above, AV (Audio Visual) data obtained by multiplexing video data and audio data is divided and recorded for each predetermined reproduction time, and divided and recorded for each AV data recorded separately. When recording the first content data in a recording area of a data recording medium in which a recording area of a predetermined capacity for adding and recording content data to be reproduced in synchronization with the reproduction of AV data being recorded is secured, The content data is encoded so that the ratio of the amount of data to be recorded in one recording area with respect to the capacity of the recording area is not more than a predetermined value, and the encoded content data is recorded in the recording area of the data recording medium. Can control content data related to AV data on a data recording medium. In addition, it is possible to record one or more content data with higher quality by using the area of the data recording medium more effectively.

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software may execute various functions by installing a computer incorporated in dedicated hardware or various programs. For example, it is installed from a network or a recording medium into a general-purpose personal computer or the like.

  FIG. 14 is a diagram illustrating an internal configuration example of a general-purpose personal computer 500. A CPU (Central Processing Unit) 501 executes various processes according to a program stored in a ROM (Read Only Memory) 502 or a program loaded from a recording unit 508 to a RAM (Random Access Memory) 503. The RAM 503 also appropriately stores data necessary for the CPU 501 to execute various processes.

  The CPU 501, ROM 502, and RAM 503 are connected to each other via a bus 504. An input / output interface 505 is also connected to the bus 504.

  The input / output interface 505 includes an input unit 506 configured with buttons, switches, a keyboard, or a mouse, an output unit 507 configured with a display such as a CRT (Cathode Ray Tube) or LCD (Liquid Crystal Display), and a speaker. Further, a recording unit 508 configured by a hard disk or the like and a communication unit 509 configured by a modem, a terminal adapter, or the like are connected. A communication unit 509 performs communication processing via a network including the Internet.

  A drive 510 is also connected to the input / output interface 505 as necessary, and a removable medium 511 composed of a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is appropriately installed, and a computer program read therefrom is loaded. Installed in the recording unit 508.

  As shown in FIG. 14, a recording medium that records a program that is installed in a computer and can be executed by the computer is distributed to provide a program to a user separately from the apparatus main body. Recording magnetic disk (including flexible disk), optical disk (including CD-ROM (Compact Disc-Read Only Memory), DVD (Digital Versatile Disc)), magneto-optical disk (MD (Mini-Disc) (registered trademark) ), Or included in the ROM 503 or the recording unit 508 in which a program is provided, which is provided to the user in a state of being incorporated in the apparatus main body in advance. Hard disk.

  In the present specification, the step of describing the program stored in the program storage medium is not limited to the processing performed in chronological order according to the described order, but is not necessarily performed in chronological order. Or the process performed separately is also included.

It is a block diagram which shows the structure of one Embodiment of the video camera to which this invention is applied. It is a block diagram which shows the example of a function structure of the control part of the video camera of FIG. It is a block diagram which shows the example of a function structure of the camera of the video camera of FIG. It is a block diagram which shows the example of a function structure of the data processing part of the video camera of FIG. It is a block diagram which shows the example of a structure of the function implement | achieved by CPU. It is a figure explaining the example of the recording format of a recording medium. It is a figure explaining the example of the recording format of a recording medium. It is a figure which shows the example of a structure of a movie information file. It is a figure which shows the example of a structure of a movie information file. It is a flowchart explaining the AV data recording process of the video camera to which the present invention is applied. It is a flowchart explaining the content data recording process of the video camera to which this invention is applied. It is a flowchart explaining the content data recording process of the video camera to which this invention is applied. It is a flowchart explaining the content data recording process of the video camera to which this invention is applied. And FIG. 16 is a block diagram illustrating a configuration example of a personal computer.

Explanation of symbols

  1 video camera, 11 control unit, 12 camera, 13 microphone, 15 line video input unit, 16 line audio input unit, 17 input detection unit, 18 input switching unit, 19 input buffer, 20 data processing unit, 21 memory, 22 drive , 41 recording medium, 61 CPU, 101 video processing unit, 102 audio processing unit, 103 image processing unit, 105 multiplexer, 121 input control unit, 122 data processing control unit, 123 recording control unit, 124 readout control unit, 211 continuous recording Area, 221 auxiliary area, 222 stream unit, 234 movie information file, 501 CPU, 502 ROM, 503 RAM, 508 recording unit, 510 drive, 521 removable media

Claims (6)

AV (Audio Visual) data, in which video data and audio data are multiplexed, is divided and recorded for each predetermined playback time, and the divided and recorded AV data is recorded for each of the divided and recorded AV data. In a recording apparatus for recording the content data on a data recording medium in which a recording area of a predetermined recording capacity for recording additional content data to be reproduced in synchronization with the reproduction of data is secured,
A reading control means for controlling reading of the content data from the recording medium;
Encoding and decoding means for encoding and decoding the content data ;
Recording control means for controlling recording of the content data on the data recording medium ;
Including
When recording the first content data in the recording area,
The encoding / decoding unit encodes the content data so that a ratio of a data amount recorded in one recording area to a recording capacity of the recording area is equal to or less than a predetermined value ,
The recording control means controls the recording of the content data encoded by the encoding / decoding means in the recording area of the data recording medium ;
When the second content data is additionally recorded in the recording area where the first content data as the content data is recorded, the recording capacity of the free area of the recording area is recorded in one recording area. When the amount of data of the second content data is smaller than
The read control means controls reading of the first content data from the data recording medium;
The encoding / decoding means decodes the first content data read from the data recording medium and records the first content data and the second content data recorded in one recording area. The first content data decoded and the second content data are encoded so that the amount of data is equal to or less than the recording capacity of the recording area,
The recording control means controls recording of the first content data and the second content data encoded by the encoding / decoding means in the recording area of the data recording medium. apparatus. The encoding / decoding means includes the first content data and the second content so that a ratio between the data amount of the first content data and the data amount of the second content data becomes a predetermined value. The recording apparatus according to claim 2, wherein the data is encoded. The recording apparatus according to claim 1, wherein the encoding / decoding unit encodes the content data at a compression rate or bit rate determined from an input path of the content data. AV (Audio Visual) data, in which video data and audio data are multiplexed, is divided and recorded for each predetermined playback time, and the divided and recorded AV data is recorded for each of the divided and recorded AV data. In a recording method for recording the content data on a data recording medium in which a recording area of a predetermined recording capacity for recording additional content data to be recorded in synchronization with the reproduction of the data is secured.
When recording the first content data in the recording area,
Encoding the content data so that the ratio of the amount of data recorded in one recording area to the recording capacity of the recording area is less than or equal to a predetermined value ;
Controlling the recording of the encoded content data in the recording area of the data recording medium ;
When the second content data is additionally recorded in the recording area where the first content data as the content data is recorded, the recording capacity of the free area of the recording area is recorded in one recording area. When the amount of data of the second content data is smaller than
Controlling reading of the first content data from the data recording medium;
The total amount of the first content data and the second content data to be recorded in one recording area by decoding the first content data read from the data recording medium is the recording area. The first content data decoded and the second content data encoded so as to be less than or equal to the recording capacity of
Control recording of the encoded first content data and second content data in the recording area of the data recording medium
A recording method comprising steps . AV (Audio Visual) data, in which video data and audio data are multiplexed, is divided and recorded for each predetermined playback time, and the divided and recorded AV data is recorded for each of the divided and recorded AV data. In a computer that performs processing for recording the content data on a data recording medium in which a recording area of a predetermined recording capacity for additionally recording content data to be played back in synchronization with data playback is secured ,
When recording the first content data in the recording area,
Encoding the content data so that the ratio of the amount of data recorded in one recording area to the recording capacity of the recording area is less than or equal to a predetermined value ;
Controlling the recording of the encoded content data in the recording area of the data recording medium ;
When the second content data is additionally recorded in the recording area where the first content data as the content data is recorded, the recording capacity of the free area of the recording area is recorded in one recording area. When the amount of data of the second content data is smaller than
Controlling reading of the first content data from the data recording medium;
The total amount of the first content data and the second content data to be recorded in one recording area by decoding the first content data read from the data recording medium is the recording area. The first content data decoded and the second content data encoded so as to be less than or equal to the recording capacity of
Control recording of the encoded first content data and second content data in the recording area of the data recording medium
A recording medium on which a program for executing processing including steps is recorded. AV (Audio Visual) data, in which video data and audio data are multiplexed, is divided and recorded for each predetermined playback time, and the divided and recorded AV data is recorded for each of the divided and recorded AV data. In a computer that performs processing for recording the content data on a data recording medium in which a recording area of a predetermined recording capacity for additionally recording content data to be played back in synchronization with data playback is secured ,
When recording the first content data in the recording area,
Encoding the content data so that the ratio of the amount of data recorded in one recording area to the recording capacity of the recording area is less than or equal to a predetermined value ;
Controlling the recording of the encoded content data in the recording area of the data recording medium ;
When the second content data is additionally recorded in the recording area where the first content data as the content data is recorded, the recording capacity of the free area of the recording area is recorded in one recording area. When the amount of data of the second content data is smaller than
Controlling reading of the first content data from the data recording medium;
The total amount of the first content data and the second content data to be recorded in one recording area by decoding the first content data read from the data recording medium is the recording area. The first content data decoded and the second content data encoded so as to be less than or equal to the recording capacity of
Control recording of the encoded first content data and second content data in the recording area of the data recording medium
A program that executes processing including steps .

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